Calcium sulfate precipitation studies with fluorescent-tagged scale inhibitor for cooling water systems

Synthesis and properties of novel fluorescent‐tagged polyacrylate‐based scale inhibitors

“…All these observations are in a good agreement with those reported elsewhere. [11][12][13][14][15][16][17][18][19][20][21][22]34…”

“…9 Along with conventional monitoring methods based on UV-vis or potentiometry, 9 the intensity of fluorescence emitted from a covalently bound to polymer tracer becomes a matter of choice. [10][11][12][13][14][15][16][17][18][19][20][21][22] An objective of the present work was to synthesize the four novel fluorescent-tagged scale inhibitors and to study their properties with an emphasis on an interaction with the background heavy metal ions, normally present in the cooling water. Thus, the two fluorescent monomers N-allyl-4-methoxy-1,8-naphtalimide (F1) and N-allyl-2-(6-hydroxy-3-oxo-3Hxanthen-9-yl)benzamide (N-allylamidefluorescein, F2) have been synthesized and then conjugated to either polyacrylate (PAA) or to the copolymer of fumaric and acrylic acids (MA-AA) to give four fluorescent-tagged derivatives: PAA-F1; PAA-F2; MA-AA-F1; and MA-AA-F2:…”

Effect of Cu2+ on the nucleation kinetics and crystallization of rod-shaped CaSO4·2H2O in aqueous solution

“…Numerous investigations on the inorganic and organic additives affect the crystallization have been well documented. [21][22][23][24][25][26] Organic acids and carboxyl-rich polymers such as fulvic acid (FA), 27 sodium dodecyl sulfonate (SDS), 28,29 and polyacrylic acid (PAA) 30 have been shown to be particularly effective in inhibiting induction period for crystallization. The mechanism of action of organic additives is mainly to complex the active groups of organic substances or to adsorb Ca 2+ in aqueous solution, reduce the supersaturation of the system to prolong the induction time of DH crystals, and form a shell-like structure on the surface of the crystal.…”

Synthesis of a polyaspartic acid/4‐(2‐aminoethyl) morpholine graft copolymer and evaluation of its scale and corrosion inhibition performance

“…Therefore, the existence of these functional groups promotes the ability to chelate metal cations. The currently used scale inhibitors mainly include organic phosphonic acids, organic phosphonates, and polymers, such as 1‐hydroxyethylidine‐1,1‐diphosphonic acid, amino trimethylene phosphonic acid, and hydrolyzed polymaleic anhydride, and these compounds have exhibited excellent performance in inhibiting scale formation . In addition, pickling inhibitors exhibit superior performance in reducing metal dissolution, even at low concentrations.…”

“…The currently used scale inhibitors mainly include organic phosphonic acids, organic phosphonates, and polymers, such as 1-hydroxyethylidine-1,1-diphosphonic acid, amino trimethylene phosphonic acid, and hydrolyzed polymaleic anhydride, and these compounds have exhibited excellent performance in inhibiting scale formation. 9,10 In addition, pickling inhibitors exhibit superior performance in reducing metal dissolution, even at low concentrations. Some heterocyclic compounds and organic amines have prominent corrosion inhibition effects, and many scale inhibitors can also be used as corrosion inhibitors.…”